Piston for an internal combustion engine
US-2025376962-A1 · Dec 11, 2025 · US
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the combustion space being almost completely enclosed in the piston, i.e. having a small inlet in comparison to its volume
the combustion space being almost completely enclosed in the piston, i.e. having a small inlet in comparison to its volume · Cooperative Patent Classification (CPC)
Engines, pumps, lighting, heating, and mechanical systems.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | F02B23/0633 |
| Official title | {the combustion space being almost completely enclosed in the piston, i.e. having a small inlet in comparison to its volume} |
| Display label | the combustion space being almost completely enclosed in the piston, i.e. having a small inlet in comparison to its volume |
| Total patents | 17 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 1 |
| 2016 | 2 |
| 2017 | 2 |
| 2018 | 3 |
| 2019 | 1 |
| 2020 | 5 |
| 2021 | 1 |
| 2022 | 1 |
| 2025 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Engine system for emission reduction without aftertreatment
US-11293339-B2 · Apr 5, 2022 · US
Engine system for emission reduction without aftertreatment
US-2021040880-A1 · Feb 11, 2021 · US
Combustion chamber structure for engine
US-10851702-B2 · Dec 1, 2020 · US
Engine system for emission reduction without aftertreatment
US-10815871-B2 · Oct 27, 2020 · US
Combustion chamber structure for engine
US-2020158006-A1 · May 21, 2020 · US
Charge-fed pre-chamber assembly
US-10598079-B2 · Mar 24, 2020 · US
Engine system for emission reduction without aftertreatment
US-2020018223-A1 · Jan 16, 2020 · US
Piston crown bowls defining combustion chamber constructions in opposed-piston engines
US-10180115-B2 · Jan 15, 2019 · US
Charge-fed pre-chamber assembly
US-2018258835-A1 · Sep 13, 2018 · US
Asymmetrically-shaped combustion chamber for opposed-piston engines
US-9995213-B2 · Jun 12, 2018 · US
Multipoint ignition systems and methods
US-9915189-B2 · Mar 13, 2018 · US
Multipoint Ignition Systems and Methods
US-2017145899-A1 · May 25, 2017 · US
Combustion chamber constructions for opposed-piston engines
US-9593627-B2 · Mar 14, 2017 · US
Swirl-conserving combustion chamber construction for opposed-piston engines
US-9512779-B2 · Dec 6, 2016 · US
Asymmetrically-Shaped Combustion Chamber For Opposed-Piston Engines
US-2016290224-A1 · Oct 6, 2016 · US
Combustion Chamber Constructions For Opposed-Piston Engines
US-2015013649-A1 · Jan 15, 2015 · US